Figure 1.

(Color online) Calendar of seasonal breeders. Small species with short gestation or incubation periods mate in spring and summer [long-day (LD) breeders]. In contrast, relatively large species with approximately six-month gestation periods mate in fall [short-day (SD) breeders]. Consequently, the offspring of both LD and SD breeders are born and raised in spring/summer. Figure adapted from Shinomiya et al. (2014)¹⁰⁴⁾ with permission under the terms of the Creative Commons Attribution License (CC BY) © 2014 Shinomiya, Shimmura, Nishiwaki-Ohkawa, and Yoshimura.